I have a Sharp LC60LE633U that I picked up earlier this year and it is allegedly a "smart" tv. Like the "smart" bluray players and other connected boxes, it works but the interface is clunky. I actually don't use any of the "apps" on the TV because it doesn't do Amazon prime streaming, so I've been using my Panasonic bluray player for that and youtube for the daughter's Donald Duck demands. I also have a cable box and a windows media center box hooked up to it, so I've got a few different media sources to chose from.
Overall, if you find ones that are compatible with the streaming services that you want to use, they should be functional, but overall, the UI leaves MUCH to be desired (at least it did on everything that I looked at).....